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A50.09 ICD-10-CM Code: Other early congenital syphilis, symptomatic

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
2 Excludes1 · 1 Excludes2

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Excludes1Never report with this code
  • nonspecific and nongonococcal urethritis (N34.1)
  • Reiter's disease (M02.3-)
Excludes2Not included here; may be reported together
  • human immunodeficiency virus [HIV] disease (B20)

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 867 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH MCC (MDC 18)
  • MS-DRG 868 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH CC (MDC 18)
  • MS-DRG 869 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITHOUT CC/MCC (MDC 18)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for A50.09 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on A50.09 itself; “inherited from” names the category or block whose note applies here.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from A50-A64

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from A50-A64

Coder workflow for A50.09

MedCoder structured workflow — derived from this code’s own official record

Before you code A50.09

  1. “Other” (NEC) means the condition is specified in the record but no dedicated code captures it. Confirm the documented form is not one a sibling code names before settling on A50.09; if the record states no specifics at all, the unspecified sibling applies instead. “Other” codes are for documented conditions the classification gives no specific code; “unspecified” codes are for records lacking the detail (Guidelines I.A.9.a, I.A.9.b).

    ReviewA50.01, A50.02, A50.03, A50.04, A50.05, A50.06, A50.07, A50.08

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with A50.09. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in A50.09’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewN34.1, M02.3

Consider A50.09. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting A50.09(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with A50.09: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareN34.1, M02.3

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of A50.09(1 note)

    Coding workflow: The conditions named in this note are not included in A50.09. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareB20

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition A50.09 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewN34.1, M02.3

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse A50.09 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of A50.09 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • N34.1— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of nonspecific and nongonococcal urethritis moves the case to N34.1; the two are not reported together unless documented as unrelated.

    Full comparison: A50.09 vs N34.1 →

  • M02.3— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of Reiter's disease moves the case to M02.3; the two are not reported together unless documented as unrelated.

    Full comparison: A50.09 vs M02.3 →

  • B20— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of human immunodeficiency virus [HIV] disease adds B20; it is not part of this code and both may be reported when both are documented.

    Full comparison: A50.09 vs B20 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Other early congenital syphilis, symptomatic is a billable ICD-10-CM diagnosis code (A50.09).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name A50.09 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 13 Excludes2 notes across 3 chapters: A65 — Nonvenereal syphilis (via A50.-), A65-A69 — Other spirochetal diseases (A65-A69) (via A50.-), A66 — Yaws (via A50.-), A67 — Pinta [carate] (via A50.-), A68 — Relapsing fevers (via A50.-), A69 — Other spirochetal infections (via A50.-), N34 — Urethritis and urethral syndrome (via A50.-), P35 — Congenital viral diseases (via A50.-), P35-P39 — Infections specific to the perinatal period (P35-P39) (via A50.-), P36 — Bacterial sepsis of newborn (via A50.-), P37 — Other congenital infectious and parasitic diseases (via A50.-), P38 — Omphalitis of newborn (via A50.-), P39 — Other infections specific to the perinatal period (via A50.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 3 Code First instructions across 2 chapters: D77 — Other disorders of blood and blood-forming organs in diseases classified elsewhere (via A50.0.-), J99 — Respiratory disorders in diseases classified elsewhere (via A50.0.-), J99 — Respiratory disorders in diseases classified elsewhere (via A50.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 79 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 867 (MDC 18), DRG 868 (MDC 18), DRG 869 (MDC 18).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):PNL009 — Perinatal infections (default); INF010 — Sexually transmitted infections (excluding HIV and hepatitis).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

A50.01 — Early congenital syphilitic oculopathy, A50.02 — Early congenital syphilitic osteochondropathy, A50.03 — Early congenital syphilitic pharyngitis, A50.04 — Early congenital syphilitic pneumonia, A50.05 — Early congenital syphilitic rhinitis, A50.06 — Early cutaneous congenital syphilis, A50.07 — Early mucocutaneous congenital syphilis, A50.08 — Early visceral congenital syphilis, A50.1 — Early congenital syphilis, latent, A50.2 — Early congenital syphilis, unspecified, A50.30 — Late congenital syphilitic oculopathy, unspecified, A50.31 — Late congenital syphilitic interstitial keratitis, A50.32 — Late congenital syphilitic chorioretinitis, A50.39 — Other late congenital syphilitic oculopathy, A50.40 — Late congenital neurosyphilis, unspecified, A50.41 — Late congenital syphilitic meningitis, A50.42 — Late congenital syphilitic encephalitis, A50.43 — Late congenital syphilitic polyneuropathy, A50.44 — Late congenital syphilitic optic nerve atrophy, A50.45 — Juvenile general paresis, +58 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Perinatal infections, Sexually transmitted infections (excluding HIV and hepatitis)).

A33 — Tetanus neonatorum, A48.51 — Infant botulism, A50.01 — Early congenital syphilitic oculopathy, A50.02 — Early congenital syphilitic osteochondropathy, A50.03 — Early congenital syphilitic pharyngitis, A50.04 — Early congenital syphilitic pneumonia, A50.05 — Early congenital syphilitic rhinitis, A50.06 — Early cutaneous congenital syphilis, A50.07 — Early mucocutaneous congenital syphilis, A50.08 — Early visceral congenital syphilis, A50.1 — Early congenital syphilis, latent, A50.2 — Early congenital syphilis, unspecified, A50.30 — Late congenital syphilitic oculopathy, unspecified, A50.31 — Late congenital syphilitic interstitial keratitis, A50.32 — Late congenital syphilitic chorioretinitis, A50.39 — Other late congenital syphilitic oculopathy, A50.40 — Late congenital neurosyphilis, unspecified, A50.41 — Late congenital syphilitic meningitis, A50.42 — Late congenital syphilitic encephalitis, A50.43 — Late congenital syphilitic polyneuropathy, +184 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Syphilis, syphilitic”; these codes share that main term but sit in a different category of the Tabular List.

A51.0 — Primary genital syphilis (bubo), A51.1 — Primary anal syphilis (primary, anal), A51.2 — Primary syphilis of other sites (primary, lip), A51.31 — Condyloma latum (condyloma), A51.32 — Syphilitic alopecia (alopecia), A51.39 — Other secondary syphilis of skin (lip), A51.41 — Secondary syphilitic meningitis (meningitis, acute), A51.43 — Secondary syphilitic oculopathy (uveitis), A51.44 — Secondary syphilitic nephritis (nephrotic syndrome), A51.45 — Secondary syphilitic hepatitis (secondary, liver), A51.46 — Secondary syphilitic osteopathy (secondary, bone), A51.49 — Other secondary syphilitic conditions (secondary), A51.5 — Early syphilis, latent (early, latent), A51.9 — Early syphilis, unspecified (early), A52.00 — Cardiovascular syphilis, unspecified (vascular), A52.01 — Syphilitic aneurysm of aorta (aneurysm), A52.02 — Syphilitic aortitis (aorta), A52.03 — Syphilitic endocarditis (aortic), A52.04 — Syphilitic cerebral arteritis (mesarteritis, brain), A52.05 — Other cerebrovascular syphilis (vascular, brain), +29 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

HIV Screening Test

Contextual Map

Every relationship of A50.09 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run A50.09 with these 10 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes (13)

Referenced by Code First instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 18 — Infectious and Parasitic Diseases, Systemic or Unspecified Sites[MDC crossing]: “Infectious and Parasitic Diseases, Systemic or Unspecified Sites — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Deafmutism NEC (acquired) (congenital), syphilitic, congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Disorder (of), blood, in congenital early syphilis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Syphilis, syphilitic (acquired), congenital, early, or less than 2 years after birth NEC, symptomatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (37)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (3)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "A50.09 — Other early congenital syphilis, symptomatic." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/a50.09-other-early-congenital-syphilis-symptomatic

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Other early congenital syphilis, symptomatic

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to A50.09 in its code family, with their registry titles.

View all codes in the A50 family